Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..175b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 1, Sept. 1990, p. 175-179.
Astronomy and Astrophysics
Astrophysics
7
Gamma Ray Spectra, Photons, Relativistic Particles, X Ray Sources, Compton Effect, Cygnus Constellation, Energy Spectra, Stellar Models
Scientific paper
The mechanisms responsible for the gamma-ray emission of Cyg X-1 and Geminga are investigated theoretically, applying the photon spectra derived by Bednarek et al. (1989 and 1990) for (1) inverse Compton scattering of arbitrary background radiation by a relativistic electron beam and (2) proton-proton interactions via pi0 decay for a relativistic proton beam. The general observational characteristics of the two objects are reviewed, and the fitting of theoretical spectra to the observed gamma-ray spectra is discussed in detail. For Cyg X-1, the behavior at energy above 1 MeV can be explained in terms of mechanism (1), assuming that the relativistic electrons are emitted in an earthward direction and have Lorentz factor about 600. For Geminga, mechanism (2) is applied, and it is inferred that the proton beam has Lorentz factor greater than 30 and is directed about 35 deg off the earthward direction.
Bednarek Wlodek
Giovannelli Franco
Karakula S.
Tkaczyk W.
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